Qt：音乐播放器

写在前面（学习Qt的记录）：因为最初的程序设计问题，造成代码的耦合性很高，各个功能函数都集中在主函数中，某些功能未有完全实现（左边树列表点下一首时，继续播放在左列表的），记录经验，吸取教训；代码就贴的主要功能，还有XML文件配置等没贴出，下面是运行效果图。

以下为各个功能函数：

1.整体可拖动窗口：

声明：

//整体可拖动窗口    void mousePressEvent(QMouseEvent *event);    void mouseMoveEvent(QMouseEvent *event);    void mouseReleaseEvent(QMouseEvent *event);

定义：

void MainWindow::mousePressEvent(QMouseEvent *event){    if(event->buttons() & Qt::LeftButton)//只响应左键    {        m_draging = true;        m_startPostion = event->globalPos();        m_framePostion = frameGeometry().topLeft();    }    QWidget::mousePressEvent(event);//调用父类保持原有按键行文}void MainWindow::mouseMoveEvent(QMouseEvent *event){    if(event->buttons() & Qt::LeftButton)    {        QPoint offset = event->globalPos() - m_startPostion;        move(m_framePostion+offset);    }    QWidget::mouseMoveEvent(event);}void MainWindow::mouseReleaseEvent(QMouseEvent *event){    m_draging = false;    QWidget::mouseReleaseEvent(event);}

左列表双击播放：

//左菜单双击播放void MainWindow::treewidgetMusic(QString leftMusic){    int count = ui->MusicWidget->count();    for(int i = 0;i < count; i++)    {        if(leftMusic == ui->MusicWidget->item(i)->text())//比较右边列表的歌名，此方法有缺陷。        {            m_playList->setCurrentIndex(i);            m_player->play();            timer->start(1000);            QIcon icon("D:/QT_Library/MusicPlayer/icon/newStop.png");            ui->playerButton->setIcon(icon);            player_stop = false;            ui->pregressHorizontalSlider->setEnabled(true);            ui->lastButton->setEnabled(true);            ui->nextButton->setEnabled(true);            ui->delButton->setEnabled(true);            ui->playerButton->setEnabled(true);        }    }}

右键菜单(槽函数连接)：

QAction *m_Love;QAction *m_Try;

void MainWindow::creatAction(){    m_Love = new QAction("添加到My-Love",this);    m_Try = new QAction("添加到Try-hear",this);}

void MainWindow::showRightMenu(QPoint pos){    QMenu *menu = new QMenu;    menu->addAction(m_Love);    menu->addAction(m_Try);    if(ui->MusicWidget->currentItem())    {//        menu->exec(QCursor::pos());        menu->exec(ui->MusicWidget->mapToGlobal(pos));//全局坐标显示    }}

播放暂停:

//播放/暂停void MainWindow::OnPlayBtnClicked(){    ui->pregressHorizontalSlider->setEnabled(true);    //正在播放showLabe显示    ui->showLabel->setText(ui->MusicWidget->currentItem()->text());    if((player_stop == false)            || (m_player->state() ==  QMediaPlayer::PlayingState))    {        timer->stop();        m_player->pause();        QIcon icon("D:/QT_Library/MusicPlayer/icon/newPlayer.png");        ui->playerButton->setIcon(icon);        player_stop = true;    }    else        if((player_stop == true)                || (m_player->state() == QMediaPlayer::PausedState))        {            timer->start(1000);            m_player->play();            QIcon icon("D:/QT_Library/MusicPlayer/icon/newStop.png");            ui->playerButton->setIcon(icon);            player_stop = false;        }}

双击播放：

void MainWindow::OnDoubleClicked(QModelIndex index){    player_stop = true;    ui->pregressHorizontalSlider->setEnabled(true);    ui->lastButton->setEnabled(true);    ui->nextButton->setEnabled(true);    ui->delButton->setEnabled(true);    ui->playerButton->setEnabled(true);    QIcon icon("D:/QT_Library/MusicPlayer/icon/newStop.png");    ui->playerButton->setIcon(icon);    player_stop = false;    ui->showLabel->setText(ui->MusicWidget->currentItem()->text());    m_playList->setCurrentIndex(ui->MusicWidget->currentIndex().row() );    m_player->play();    timer->start(1000);    time.setDate(date);//所以上边的data初始化时,数值不为0就好    time.setTime(timeProgress);}

上一首：

//上一首void MainWindow::LastMusic(){//    ui->playerButton->setText("暂停");    QIcon icon("D:/QT_Library/MusicPlayer/icon/newStop.png");    ui->playerButton->setIcon(icon);    player_stop = false;    m_player->setPosition(0);    ui->pregressHorizontalSlider->setValue(m_player->position());    //这里注意的是，和我们正常数数一样，mediaCount是从1开始计数的    if(m_playList->currentIndex()!=0)    {        m_playList->setCurrentIndex(m_playList->previousIndex());        m_playList->previous();        m_player->play();    }    else    {        m_playList->setCurrentIndex(m_playList->mediaCount()-1);        m_player->play();    }}

下一首：

//下一首void MainWindow::NextMusic(){    QIcon icon("D:/QT_Library/MusicPlayer/icon/newStop.png");    ui->playerButton->setIcon(icon);    player_stop = false;    m_player->setPosition(0);    ui->pregressHorizontalSlider->setValue(m_player->position());    //这里注意的是，和我们正常数数一样，mediaCount是从1开始计数的    if(m_playList->mediaCount() - m_playList->currentIndex()!=1)    {        m_playList->setCurrentIndex(m_playList->nextIndex());        m_player->play();    }    else    {        m_playList->setCurrentIndex(0);        m_player->play();    }}

播放模式：

//播放模式void MainWindow::OnConBoxChangeClicked(int number){    switch (number)    {    case 0:        m_playList->setPlaybackMode(QMediaPlaylist::Loop);//循环列表        qDebug() << "0";        break;    case 1:        m_playList->setPlaybackMode(QMediaPlaylist::CurrentItemInLoop);//当前单曲循环        qDebug() << "1";        break;    case 2:        m_playList->setPlaybackMode(QMediaPlaylist::Random);//随机        qDebug() << "2";        break;    default:        break;    }}

音量调节：

//音量调节void MainWindow::OnVolumeChange(int volume){    m_player->setVolume(volume);}

快进：

//快进void MainWindow::HorizontalSliderChange(int value){    if(m_player->state() == QMediaPlayer::PlayingState)    {       m_player->setPosition(value);       m_player->pause();       QIcon icon("D:/QT_Library/MusicPlayer/icon/newPlayer.png");       ui->playerButton->setIcon(icon);       player_stop = true;    }    m_player->play();    QIcon icon("D:/QT_Library/MusicPlayer/icon/newStop.png");    ui->playerButton->setIcon(icon);    player_stop = false;}

进度条跟随：

//进度条跟随void MainWindow::ChangPostion(){    //music->position()获取音乐当前播放位置    curr_position = m_player->position();    //music->duration()获取音乐总长度(注意:这个长度是音乐大小)    ui->pregressHorizontalSlider->setMaximum(m_player->duration());    if(curr_position >= ui->pregressHorizontalSlider->maximum())//播放完毕    {        timer->stop();        m_player->stop();        QIcon icon("D:/QT_Library/MusicPlayer/icon/newPlayer.png");        ui->playerButton->setIcon(icon);        player_stop = true;        ui->pregressHorizontalSlider->setSliderPosition(0);        time.setDate(date);        time.setTime(timeProgress);//重新把时间标签改为00:00        m_playList->next();    }    timer->start(1000);    m_player->play();    //刷新滑块位置    ui->pregressHorizontalSlider->setSliderPosition(curr_position);}

实时播放时间：

//实时时间void MainWindow::upTime(qint64 position){      QTime duration(0, position / 60000, qRound((position % 60000) / 1000.0));    ui->startTimeLabel->setText(duration.toString("mm:ss"));    if(!(m_playList->isEmpty()))    {        //当前播放歌曲在列表醒目提示        ui->MusicWidget->setCurrentRow(m_playList->currentIndex());        //正在播放showLabe显示        ui->showLabel->setText(ui->MusicWidget->currentItem()->text());    }}

播放总时间：

//播放总时长void MainWindow::endTime(qint64 position){    if(m_player->state() == QMediaPlayer::PlayingState)    {        QTime duration(0, position / 60000, qRound((position % 60000) / 1000.0));        ui->endTimelabel->setText(duration.toString("mm:ss"));    }}

删除歌曲：

//删除void MainWindow::delBtnClicked(){    QListWidgetItem *item = ui->MusicWidget->currentItem();    ui->MusicWidget->removeItemWidget(item);    delete item;    if(m_playList->mediaCount() > 1)    {        qDebug() << "++++++++++++++++++++";        qDebug() << m_playList->mediaCount();        m_playList->removeMedia(m_playList->currentIndex());        m_player->EndOfMedia;    }    else        if(m_playList->mediaCount() == 1)        {            qDebug() << "--------------";            qDebug() << m_playList->mediaCount();            m_playList->clear();            m_player->stop();            timer->stop();            ui->showLabel->clear();            ui->MusicWidget->clear();            ui->playerButton->setDisabled(true);            ui->pregressHorizontalSlider->setDisabled(true);            ui->nextButton->setDisabled(true);            ui->lastButton->setDisabled(true);            ui->delButton->setDisabled(true);        }}

美化相关：

//Qcombox美化设置/委托    QStyledItemDelegate* itemDelegate = new QStyledItemDelegate();    ui->comboBox->setItemDelegate(itemDelegate);    //允许鼠标右键操作    ui->MusicWidget->setContextMenuPolicy(Qt::CustomContextMenu);    //关闭滚动条    ui->MusicWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);    ui->MusicWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

setWindowFlags(Qt::Window | Qt::FramelessWindowHint);//无边框设置setAttribute(Qt::WA_TranslucentBackground);//设置背景透明

主设计界面（偷懒，皮肤直接用的styleSheet）


具体代码：

源码下载